#include <bits/stdc++.h>
#include <iomanip>
using namespace std;

int n;
double p, q, r;

int main()
{	
	cin >> n >> p;

	if (n < 200) {
		r = p;
		q = p;

		for (int i = 1; i < n; i++) {
			r *= 1 - p;
			q += r;
		}

		cout << setprecision(10) << q << endl;
	}
	else
		cout << 1 << endl;
}